1 What is Niazid?

Brand: Niazid

Generic: Isoniazid

Niazid is a drug used in the treatment of all forms of tuberculosis. This drug is available as an injection solution containing isoniazid 100 milligrams in 1 milliliter. It is also available as syrup containing isoniazid 50 milligrams in 5 milliliters or as a tablet containing 100 mg or 300 mg of isoniazid.


You should read the product information leaflet before using this medication. If you have any questions, ask your doctor or pharmacist.

The tablet should be taken by mouth as instructed by your doctor. Do not crush or chew the drug because it may diminish its effects. This medication should be taken with a full glass of water unless your doctor tells you otherwise. You should swallow the drug whole. For oral solutions, use a measuring spoon. The injectable form is usually given by a healthcare professional.

Your dosage is based on your medical condition and the way you will respond to treatment. Take this drug regularly to experience the most benefits. You should also take this drug at the same time each day.

If you miss a dose, use it as soon as you remember. Continue to use it as prescribed by your doctor or as stated on the package label.


Niazid may interact with medications such as:

  • Acetaminophen
  • Certain azole antifungals:
    • Itraconazole
    • or Ketoconazole
  • Carbamazepine
  • Disulfiram
  • MAO inhibitors:
  • Phenytoin
  • SSRI antidepressants such as:
    • Fluoxetine
    • or Sertraline
  • Theophylline
  • Valproic acid

Side Effects:

There are no side effects known aside from a possible allergic reaction in people who have previous or unknown hypersensitivity to the drug.

Watch out for signs of allergic reactions such as:

  • Rash
  • Itching
  • Swelling


Before taking this medication, tell your doctor or pharmacist if you have the following:

  • Allergy to isoniazid
  • Previous severe reaction from isoniazid such as:
  • Liver disease
  • Alcohol use
  • HIV infection
  • Kidney disease
  • Diabetes
  • Numbness or tingling of arms or legs (peripheral neuropathy)
  • Recent childbirth
  • Pregnancy or lactation

2 Related Clinical Trials